As with the post above, see if you can get it to run an offical game card. If you can get it to run an offical card then it is likely the AK2i that is bad. If it is the actual card reader then see if your unit is still under warranty and trade it for a new one. If it is not under warranty then you will need a new reader, but I have not seen anything about replacing it like the DS Lite. That doesn't mean it cannot be done, I just haven't heard anything about it. Best of luck to you, hope it plays an offical card. Later.
Elmoreas